feat: Add server configuration field for fDroid

app/src/main/java/org/fossasia/openevent/general/MainActivity.kt

@@ -20,6 +20,7 @@ import org.jetbrains.anko.design.snackbar
 import org.koin.androidx.viewmodel.ext.android.viewModel
 
 const val PLAY_STORE_BUILD_FLAVOR = "playStore"
+const val FDROID_BUILD_FLAVOR = "fdroid"
 
 class MainActivity : AppCompatActivity() {
     private lateinit var navController: NavController

app/src/main/java/org/fossasia/openevent/general/di/HostSelectionInterceptor.kt

@@ -0,0 +1,28 @@
+package org.fossasia.openevent.general.di
+
+import okhttp3.HttpUrl.Companion.toHttpUrlOrNull
+import okhttp3.Interceptor
+import okhttp3.Response
+import org.fossasia.openevent.general.BuildConfig
+import org.fossasia.openevent.general.data.Preference
+import org.fossasia.openevent.general.settings.API_URL
+
+class HostSelectionInterceptor(private val preference: Preference) : Interceptor {
+
+    override fun intercept(chain: Interceptor.Chain): Response {
+        var original = chain.request()
+        val httpUrl = preference.getString(API_URL)?.toHttpUrlOrNull()
+        if (original.url.host == BuildConfig.DEFAULT_BASE_URL.toHttpUrlOrNull()?.host && httpUrl != null) {
+            val newUrl =
+                original.url.newBuilder()
+                    .scheme(httpUrl.scheme)
+                    .host(httpUrl.host)
+                    .port(httpUrl.port)
+                    .build()
+            original = original.newBuilder()
+                .url(newUrl)
+                .build()
+        }
+        return chain.proceed(original)
+    }
+}

app/src/main/java/org/fossasia/openevent/general/di/Modules.kt

@@ -244,7 +244,7 @@ val viewModelModule = module {
     viewModel { AboutEventViewModel(get(), get()) }
     viewModel { EventFAQViewModel(get(), get()) }
     viewModel { FavoriteEventsViewModel(get(), get(), get()) }
-    viewModel { SettingsViewModel(get()) }
+    viewModel { SettingsViewModel(get(), get()) }
     viewModel { OrderCompletedViewModel(get(), get(), get(), get()) }
     viewModel { OrdersUnderUserViewModel(get(), get(), get(), get(), get()) }
     viewModel { OrderDetailsViewModel(get(), get(), get(), get()) }
@@ -286,6 +286,7 @@ val networkModule = module {
         val builder = OkHttpClient().newBuilder()
             .connectTimeout(connectTimeout.toLong(), TimeUnit.SECONDS)
             .readTimeout(readTimeout.toLong(), TimeUnit.SECONDS)
+            .addInterceptor(HostSelectionInterceptor(get()))
             .addInterceptor(RequestAuthenticator(get()))
             .addNetworkInterceptor(StethoInterceptor())
 

app/src/main/java/org/fossasia/openevent/general/settings/SettingsFragment.kt

@@ -7,21 +7,28 @@ import android.os.Bundle
 import android.text.Editable
 import android.text.TextWatcher
 import android.view.MenuItem
+import android.webkit.URLUtil
 import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.isVisible
 import androidx.navigation.fragment.findNavController
 import androidx.lifecycle.Observer
 import androidx.navigation.fragment.navArgs
 import androidx.preference.Preference
+import androidx.preference.PreferenceCategory
 import androidx.preference.PreferenceManager
 import androidx.preference.PreferenceFragmentCompat
+import kotlinx.android.synthetic.main.dialog_api_configuration.view.urlTextInputLayout
+import kotlinx.android.synthetic.main.dialog_api_configuration.view.urlEditText
+import kotlinx.android.synthetic.main.dialog_api_configuration.view.urlCheckBox
 import org.jetbrains.anko.design.snackbar
 import kotlinx.android.synthetic.main.dialog_change_password.view.oldPassword
 import kotlinx.android.synthetic.main.dialog_change_password.view.newPassword
 import kotlinx.android.synthetic.main.dialog_change_password.view.confirmNewPassword
 import kotlinx.android.synthetic.main.dialog_change_password.view.textInputLayoutNewPassword
 import kotlinx.android.synthetic.main.dialog_change_password.view.textInputLayoutConfirmNewPassword
 import org.fossasia.openevent.general.BuildConfig
+import org.fossasia.openevent.general.FDROID_BUILD_FLAVOR
 import org.fossasia.openevent.general.PLAY_STORE_BUILD_FLAVOR
 import org.fossasia.openevent.general.R
 import org.fossasia.openevent.general.auth.MINIMUM_PASSWORD_LENGTH
@@ -80,6 +87,12 @@ class SettingsFragment : PreferenceFragmentCompat(), PreferenceChangeListener {
             profileViewModel.isLoggedIn()
         preferenceScreen.findPreference<Preference>(getString(R.string.key_timezone_switch))?.isVisible =
             profileViewModel.isLoggedIn()
+
+        preferenceScreen.findPreference<PreferenceCategory>(getString(R.string.key_server_configuration))
+            ?.isVisible = BuildConfig.FLAVOR == FDROID_BUILD_FLAVOR
+
+        preferenceScreen.findPreference<Preference>(getString(R.string.key_api_url))?.title =
+            settingsViewModel.getApiUrl()
     }
 
     override fun onPreferenceTreeClick(preference: Preference?): Boolean {
@@ -99,6 +112,9 @@ class SettingsFragment : PreferenceFragmentCompat(), PreferenceChangeListener {
                 }
             })
 
+        if (preference?.key == getString(R.string.key_api_url)) {
+            showChangeApiDialog()
+        }
         if (preference?.key == getString(R.string.key_visit_website)) {
             // Goes to website
             Utils.openUrl(requireContext(), WEBSITE_LINK)
@@ -146,6 +162,46 @@ class SettingsFragment : PreferenceFragmentCompat(), PreferenceChangeListener {
         return false
     }
 
+    private fun showChangeApiDialog() {
+        val layout = layoutInflater.inflate(R.layout.dialog_api_configuration, null)
+        layout.urlCheckBox.text = BuildConfig.DEFAULT_BASE_URL
+
+        val dialog = AlertDialog.Builder(requireContext())
+            .setView(layout)
+            .setPositiveButton(getString(R.string.change)) { _, _ ->
+                val url = if (layout.urlCheckBox.isChecked) BuildConfig.DEFAULT_BASE_URL
+                                else layout.urlEditText.text.toString()
+                if (url === settingsViewModel.getApiUrl()) return@setPositiveButton
+                settingsViewModel.changeApiUrl(url)
+                view?.snackbar("API URL changed to $url")
+                findNavController().popBackStack(R.id.eventsFragment, false)
+            }
+            .setNegativeButton(getString(R.string.cancel)) { dialog, _ -> dialog.cancel() }
+            .setCancelable(false)
+            .show()
+        dialog.getButton(AlertDialog.BUTTON_POSITIVE).isEnabled = false
+
+        layout.urlCheckBox.setOnCheckedChangeListener { _, isChecked ->
+            layout.urlTextInputLayout.isVisible = !isChecked
+            dialog.getButton(AlertDialog.BUTTON_POSITIVE).isEnabled = isChecked
+        }
+
+        layout.urlEditText.addTextChangedListener(object : TextWatcher {
+            override fun afterTextChanged(s: Editable?) {
+                val url = s.toString()
+                val isValidUrl = (URLUtil.isHttpUrl(url) || URLUtil.isHttpsUrl(url)) &&
+                    URLUtil.isValidUrl(url)
+                dialog.getButton(AlertDialog.BUTTON_POSITIVE).isEnabled = isValidUrl ||
+                    layout.urlCheckBox.isChecked
+                if (!isValidUrl) layout.urlEditText.error = getString(R.string.invalid_url)
+            }
+
+            override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) { /*Implement here*/ }
+
+            override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) { /*Implement here*/ }
+        })
+    }
+
     private fun startAppPlayStore(packageName: String) {
         try {
             startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(settingsViewModel.getMarketAppLink(packageName))))

app/src/main/java/org/fossasia/openevent/general/settings/SettingsViewModel.kt

@@ -5,12 +5,19 @@ import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
 import io.reactivex.disposables.CompositeDisposable
 import io.reactivex.rxkotlin.plusAssign
+import org.fossasia.openevent.general.BuildConfig
 import org.fossasia.openevent.general.utils.extensions.withDefaultSchedulers
 import org.fossasia.openevent.general.auth.AuthService
 import org.fossasia.openevent.general.common.SingleLiveEvent
+import org.fossasia.openevent.general.data.Preference
 import timber.log.Timber
 
-class SettingsViewModel(private val authService: AuthService) : ViewModel() {
+const val API_URL = "apiUrl"
+
+class SettingsViewModel(
+    private val authService: AuthService,
+    private val preference: Preference
+) : ViewModel() {
 
     private val compositeDisposable = CompositeDisposable()
     private val mutableSnackBar = SingleLiveEvent<String>()
@@ -53,6 +60,15 @@ class SettingsViewModel(private val authService: AuthService) : ViewModel() {
             })
     }
 
+    fun getApiUrl(): String {
+        return preference.getString(API_URL) ?: BuildConfig.DEFAULT_BASE_URL
+    }
+
+    fun changeApiUrl(url: String) {
+        preference.putString(API_URL, url)
+        logout()
+    }
+
     override fun onCleared() {
         super.onCleared()
         compositeDisposable.clear()

app/src/main/res/layout/dialog_api_configuration.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical" android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <CheckBox
+        android:id="@+id/urlCheckBox"
+        android:layout_margin="@dimen/layout_margin_large"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
+
+    <com.google.android.material.textfield.TextInputLayout
+        style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox.Dense"
+        android:id="@+id/urlTextInputLayout"
+        android:layout_margin="@dimen/layout_margin_large"
+        android:hint="@string/other_url"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
+
+        <com.google.android.material.textfield.TextInputEditText
+            android:id="@+id/urlEditText"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content" />
+
+    </com.google.android.material.textfield.TextInputLayout>
+
+</LinearLayout>

app/src/main/res/values/strings.xml

@@ -204,6 +204,12 @@
     <string name="visit_website">Visit Website</string>
     <string name="key_visit_website">Visit_Website</string>
     <string name="not_logged_in">No account logged in</string>
+    <string name="server_configuration">Server configuration</string>
+    <string name="key_server_configuration">server_configuration</string>
+    <string name="api_url">Api url</string>
+    <string name="key_api_url">api_url</string>
+    <string name="other_url">Other url</string>
+    <string name="invalid_url">Invalid url</string>
 
     <!--settings profile dialog-->
     <string name="message">Are you sure you want to log out?</string>

app/src/main/res/xml/settings.xml

@@ -1,6 +1,19 @@
 <?xml version="1.0" encoding="utf-8"?>
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <PreferenceCategory
+        android:title="@string/server_configuration"
+        android:key="@string/key_server_configuration"
+        app:iconSpaceReserved="false">
+
+        <Preference
+            android:title="@string/api_url"
+            android:key="@string/key_api_url"
+            app:iconSpaceReserved="false"/>
+
+    </PreferenceCategory>
+
     <PreferenceCategory
         android:title="@string/logged_in_account"
         android:key="@string/key_account"